As Christians, we are no longer under the Old Law. That was a covenant with the children of Israel and converts to the Jewish faith. There is a new covenant, which is the covenant under which Christians get their authority.
Yes, of course.
But, when people pointed you to Psalms 149 and 150, which specifically mention playing musical instruments in praising God, you responded by saying the OT is not binding for Christians. How you relate the OT Law to the Psalms remains unclear to me. No one was saying those Psalms commanded the playing of instruments. Are you?
At any rate, it seems what you're saying is, although it used to be good to praise the Lord in the playing of musical instruments, something about the New Covenant has made musical instruments unacceptable, or even bad, for praise and/or worship. Correct?